Milking machine



Aug. 7, W23.

-J. C. BEEM MILKING MACHINE Filed Nov. 14, 1922 3 sheets-sheet 1 Aug. 7, W23. 11 4 J. c. IBEEM MIHXING MACHINE Filed Nov. 14. 1922 s'sheets-sheet 2 INVENTOR J. c. BEEN MILKING MACHINE Fi1e 'Nov. 14%, 1922 3 Sheets-Shnet 5 INVENTOR Patented 'Aug. Z, 1923.

es 1%. a tin-a rain". as

trainee JOHN o fBnEi/I, or'sAwTnLLE, oeniroania' ivririzrne MACHINE.

Application filed November '14, 1922. Serial No. 600,938.

7T0 all whom it may concern.

3c it known that 1, JOHN -C. BnnM, a citizen of the United States, residing at Sawtelle, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Milking Machines, of which thefollowing is a speci-v fication.

This invention relates to improvements in milking machines of that type disclosed in patents granted to me on Flay 10, 1921, numbered 1,377,546'and 1,377,547. c i

In the structure disclosed in my patents above referred to more or less difficulty and unnecessaryexpense is experienced in the use thereof due to the complicated construction of and arrangement of-the milk re ceiving chambers and the 'valve'm'echanisms for causingrand controlling the inflow and outflow of the milk thereinto and therefrom.

Therefore, the invention seeks to provide a simple, inexpensive and durable milking machine, adaptableto use upon; varied numbers of a plurality of cows simultaneously, and which may be readily adjusted to suit the conditions necessary to the proper effective operation thereof under the said varied adjustments. 7

Theinvention further seeks to provide a structure so simple and compact in its nature as to reduce the labor incident to the thoroughand sanitary cleansing thereofto the minimum and to provide parts so stand ardized as to permit of easy substitution and replacement at a minimum expense.

.Vvith the above and other objects in view which will hereinafter fully appear, the

invention resides in those novel details of combination, construction and arrangement of parts, all of which will be first fully de scribed, then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which :7

Figure 1 is a side elevation of thein vention, 4. several positions of theoperating handle or lever being shown. V

Figure 2 i's a vertical cross section of the invention taken through the valve mechanism at one end of the machine.

Figure 3 is a verticallongitudinal section taken substantially on the line 3-3 on Figure 2, parts being shown iniside ele-' vation. 1 p a Figure 4 is an end elevation of the machine looking in the direction of the arrow on Figure 1.

Figure 5 is a horizontal section, parts b'eing in plan view, of one of the valve mechanisms.

Figure 6 is a detail front end elevation,

of the main casing cylinder.

Figure 7 is a face view of the casing end clamp ring.

F igure 8 is a detail perspective View of the means for connectingthe flGXlblG pipe 1 lines to thevalve mechanisms.

In the drawings, in which like numeralsof reference indicate like parts in all the figures, 1 represents the main casing member which is in the nature of a hollow cylinder open .at both ends and which is constructed of any material suitable to the uses to which the same is put. 15nd hearing rings 2, formed on supporting frames 3, are provided to accommodate the ends of the cylindrical casing 1. The frames 3 are suitably secured, as at 4, to the base member ,5.

. The open ends of the casing are internally threaded as at 6 to receive end closure plugs 7 which include, at their outer faces, squared turning heads 8 for thereception of a wrench or other turning'implement, and the said plugs, threaded air tight into the said cylinder ends, close the said ends and provide therebetween a milk receiving chamber 9. I

A piston 10 is adapted to be reciprocated within the said chamber 9 to effect the alternate sucking in and forcing" out of the milk interior of the chamber 9 through slotw'ays 13 cut through the wall of the casing 1, as shown, see Figures 3 and 6; A plurality of piston operating rods 14 (one for each bore: and slotWay 12- 13, four being shown), are slidable through the bores 12 in unison by reason of their rigid connection with the operating head or rlng 15, as

- shown, see Figures 3 and 4,";and;:tl1e-said rods 14'hiave'connection withthe pi'stonf 10, to effect the proper reciprocation thereof,

through screw coupling rpins 16 threaded through the inner endsotf the said rods 14 and projecting into apertures formed therei for in the said piston. The screws 16 are countersunk and rounded O f-f t permit the easy sliding of the bars l4'through, the bores 12 when the piston'isbein'g reciprocated in the manner soon to be explained.

-- The inner ends of the rods 14' are reduced and are fitted with packing washers 17 held in proper position upon the said rods by washer and nut connection 18 forlthe purpose of making a fluid tight fit for the said.

at the interval of each slotway 13, asshown The end of each bore 12 is'enlarged as'at 20 to receive suitable packing and the ends of the slotways 13,11ow unused are suitably packed as at 21 so that leakage of milk from the chamber 9 to the exterior is impossible as is also the leakage from the chamber at oneside of the piston 10, while working into'the chamber at the other side thereof.

The casing 1 is held from longitudinal displacementtrom proper position within the end bearings 2 byfclamping rings 22 and one of the said rings has cut out portions23 to register with the bores 12 and slotways 13 of the casing 1, see Figure 7 The rings 22 are fixed in place on the casing ends by means of clampscre-ws 24, as shown, see Figures 1 and r j i The casing 1 is held from displacement due to any rotative tendency by a single set of each end bearing, as

28 secured upon. the base 5. The said levers are joined at their upper ends, to move in unison, by a cross bar 29, and are link con nected as at 30, to a pair of operating or slidexbars 31 slida ble in 'ways 32 formed therefor on the circumferential surface of the casing 1 and the said bars pass through slotwaysj33 in the front ring bearing 2 and are rigidly "secured, as at 84, to the operating head ring 15, see Figures-1 and 4. By oscillating the lever 26-29 reciprocating motion is imparted to the piston 10 through 30, 15, 14 and 16 and the said piston operates to effect the milking of the cow or respective cleaning out the "interiorkof. the casing 1 iand'when so removedgthe pr'ocessof cleaning is not in any way "hindered ba -projecting shouldersland it will be", also appa-rentthat by merely removing the front plug '7 and the packing 21 the piston 10 may belr'eadily,

withdrawn with all its rods 14 attached thereto, I have made it also possible to withdraw the head-15iand its connectedrods 14 without removing the piston lOand plug 7. I provide a screw plug 'at that point at which each of the screws 16 would be posiv tioned when-the piston isatthe forward limit of its stroke and the said plug is of a size sufficient to permit the introduction of a- .tool and the withdrawal of the screw coupling pins 16, as desired. 7 I

The casin 1 cows, as the case maybe, in; the manner, 1 "soon 0 bedesciibed. V and are'caused to movelongitudinally andv I v jderst'ood that the plugs 7 may be removed for '70 is provided, at each poi'nt at'which the ports 11. are bored, with aj pendant hub portion 36 and the said hub portion is provided with' an, externally ing a valve chamber 38'.

Cooperative 'with each valve chamber 3 8 threaded portion 37 and a central bore torni- 4 is Valve y Construction-of both valve bodies being identical the de tailed description of one will suffice iorbothv The valve body-"includes an internally threaded socket40 for threading the said bodyupon the threaded portion 37- of the hub 36, and the said bodyfincludos lateral projecting portions 41 and a central projecting portion 42. Itshould be noted that the ring bearing supports-3 are bowed't permit the turning ofthe valve body when threading the same into pla e, see Figures 3 and 4. The lateral portions 41 have lateral milk introduction pass'ages'43 and the'p'romunication with the chamber 38, those through the vertical concentric passage 45* and the passage 44 through an eccentrically The outerends of each 41 and 42' are provided with an internally threaded chamber 47 adaptedto receive the threaded hollow -plug 48 which includesfa Q turning head or nut 49 and ,a central aper- I 'jection 42 is provided with a milk exhausting ;passage 44 and all such passages h'avecomture 50 through which. the v enlargedends 51 01" the several milk conducting tubes 52 and 72 are inserted and, held in fluid-tightrelatlon with the respective valve bodyfp'rojections through the engagement therewith erals 41, are desi'gnated52, and the exhaustdesignated 7 2. Theitubes 52 and 72 and the and when the said heads; 5.1 11,13 inse ted.

V of the. two part clamp rings 53, as shown; The induction tubes, connected to the lat 'ing tubes, leading from the laterals 42, are

ber fromone to four with the-same perfectness of operation. Itpis to beiunderstood that-each "of the-tubes 52 leading from the laterals l-l leads to'any approved type of teatcup applied to the teats of the-udder of thecow and are therefore styled induction tubes because. therethrough the milk is inducted by suction into the chamber 9. The tubes 72 which have connection with the'projections 42 are styled the exhausting tubes since it is through the latter that the milk is exhausted, by pressure, into the receptacle provided for that purpose. No

particular design of teat cup mechanism is illustrated since the same constitutes no part ot the present invention.

. At a point between the connections of the induction tubes 'with the lateral passages 43 and the vertical pass 45, on eachside of said latter pass, is )rovided a milk flow regulating and cut-o valve 54 rotatable in a vertical bore crossing the said passages 4?), having the usual fluid-passage aperture therethrough and suitably packed, milk tight, as at 55. The valve is rotated to regulate I the inflow of milk from the particularcow being milked or for the purpose of cutting off the particular passage 43 entirelyby a turning crank 56 movable between a pair of limiting pins 57. Thus, it will be seen' that it is'possible to regulate the flow of milk throug y P ticular passage 43 or set of'passages 43 or -tocompletely cut ofi any particular passage 43 or set ofpassages 43 and'so it is possible -to milk four cows simultaneously or any number within that'total with the same perfectness of operation as will later appear.

The 7 central projection 42 is provided with a large bore; merging with the milk passage 44. and thesame constitutes avalve chamber 58. The valve chamber 58 is provided'with a valve seat member 59 and the latter carries afla p check valve 60, see Figures 3 and 5. In additionto the conduit tube clamp connection at the end ofthe-pro- "j'ection 42; the construction of which is standardized in this invention, a Washer 61 is fittedand the'same isprovided with a central milk'passa'ge 62 which is restricted for a purpose later to beexplained.

A flap check-valve '63 is mounted within the central =valve chamber 38, over the-vertical pass 45,- and the said includes a 'cut out portion" 64" 'extending-arouudthe ivertical exhausting pass 46; the purpose for which will also 'be later. explained, see Figures 3and- 5. V

Each valve body 39Vis provided at some point between the valves 54, with an air duct 65 adapted to pass air into the'lateral passages 43 when it is sodesired. For closing this air duct 65 when its function is unnecessary and thereforeundesirable, I

provide a closure plug 66 which includes 1 an air port engaging-face 67 covered with some material which will effect the closing off of atmospheric. communication with" the passages 43 when it is so desired. The plug 66- has a turning head and is mounted upon a screw which .is threaded into the socket provided therefor in the valve body-39rand, for preventing the possibility of the. plug being withdrawn completely from the valve body, I provide a stop screw 68 which includes axhe'ad projecting into the path of outward movement of the plug 66 as shown, see Figure 5. V r

The assembly i The following will give 7 a" clear idea. of

the simplicity ofzconstru ction of the inlvention and of its ready. adaptability to proper cleansing;

- The ring bearings zcarried by their supporting frames 3 would be properly slipped over the ends of the casing 1 andthen be secured to the base as at'4. The rear plug 7 would then be applied fluid-tight into the rear end of the casing through the' medium of a'wrenc h' applied to' the squared head 8. The rear ring 22 would next beapplied and fixed by the screw bolts 24 and the casing "end securely clamped against displacement by the clamping of the screw 25 in the top of the ring 2.' The front'clamp screw 25 could now be screwed home and the casing is now'firmlymounted ready for the application of the piston and the operating means therefor. The piston 10,the packings 19,

the screws 16, the rods 14, the packings 17 1.8, the operating head '15 and the bars 31 could then be assembled as a unit" andslid,

I p The front plug 7 would then be properly inserted fluid-tight "into the front end of theicasingl The front "ring/clamp 22 shouldhave been applied to as a whole, into place.

the casing end;- as: the piston etc. were being gi1'1serted,f'but not clamped on, so that: the same maybes'lid back'to' permit the proper introduction of the-packing elements 19 and "20 after which the saidring clamp 22zwould 'behxed' into'prope-r" position on the front 'en'd'of the casing. The brackets 28. would 1 thenbe fix ed to the base 5xan'd the "levers lin'ke'd as, 30 to the bars 31 when the casing and'piston structures would be ready for operation; Thevalvelbodies 39 are made as complete 'unitsaud would be applied as such by threading the'same "onto the threaded hubs 3'7 of the; casing The 'various tubes-'52 and, 7 2 "would thenbe" applied as has been, heretoforeuexplained and the machine is readyfor operation as follows. J

i j Operatiohl lt 'shoi'ildfbe clearly un lerstood that oscillation of the lever .26 imparts reciprocatoiy motion tothe-pistonlO andgthat such reciprocation of the piston. creates pressure This it will be seen I end and forced out of the port at-the op- .posite endrsirnultaneously and continuously -so long as'the operation is continued.

Assuming that the piston is being moved .towardthgright, as shown in Figure S, milk will be pumpedlfrom the udder of each of the'pair'of cows cooperating through the lateral tubes 52 with the lateral passages 43 at that end of-lthe machine which is atthe left of- Figure 3.; The milk thus pumped flowsthrough each of the said passages 43', up through the passage45, the flap valve "63 being raised by the-suction, and through :the portrespective'chamber 38 and-port 11 into the chamber 9 behind the piston. Simultaneously, the valve mechanism to the right "of the figure is functioning to permit the exhausting'ofthe milk which the piston is forcing before it as follows: The milk passes out through. the port 11 into the "chamber 38. held so by the pressure of the fluid, to eifec- 'tively shut off communication with thepas- The flap valve is closed, and

sages 4:3 to thereby prevent the forcing of theliquid back again to irritate the cows from which it was originally-drawn." From 'gthe-chamber -38the' milk flows through the ont out portion-64 of the flap valve, through the passage 44-, through 'the va-lve GOa-nd tube 72toi the collecting receptacle provided for the purpose.

Th valve acts as a .back check valve to prevent thepossibility of the: milk being suckedxback out of the 1 receptacle last "mentioned "onthe next stroke of the piston.- The valves function' to first 1 suck in then exhaust the milk, and theoperu.

iation issuch that when thechamber is filled at the end of the stroke in either-direction, suction [ceasesn on the ,teats .from which the 7 milk :w'as drawn; giving them airest from "thelactionof -the 'pumpwhile the milk is being discharged; Thus, the teats are; al-

-lowjed"to 'fill naturally from the udder rof 3 eacl1;cow,' which renders the milking process less annoying. It will be noticed that the opening '61 through which :the exhausting milk is forced topass-is restricted. This is done to makethe milk pass out more slowly charged.

thesaidj chambergf I 2. A m lking mach ne}, comprisinga cylin- V drical open ended casing, supports for" said tion vwould be broken. and the operation of the machine affected if] the milk should at c any time flow out more rapidly than the in-' how at the opposite end. By the use of the :valves 5ateeach' lateral passageway l3-is 7 sub- .ject tocontrol as aunit and assuch may be regulated as to the amount of milk to flowtherethrough or closed ofi' entirely. in which event the passageway at the:-oppositeside only Will function. Itis. also possible-to cut ofi both valves '5 at one. end of the machine than the inflowi and togthereby inslire the" ,cont nuityof and the degree of suctlon-necessary. This is necessary because the sucto thereby render that 'complete side of. the .3

machine inoperative and to permitpnly thosepassages attheopposite machine end to function. In-Vthe lastgdescribed-adjustment itjis necessarythat air be admitted into'the chamber 9 to permit the piston to function properly and for this purpose the airduct is vopened--to fatmospheric communication by turning back the head 661515 herei-nbefore described. 7 To strip the cows T cut off three. of the cows by proper turning of the valve 54,"'and work the piston, slowly at the partial stroke quantities may be readily dis} and small 7 By reference to the description of the 'asseml'ilageuof the machine it will be. readily apparent how thoroughly and practically the m'a'chine may be knocked down for scouring.and'sunning. r

The machine may-also be well cleansed without completely disassembling thesame by merely pumping hot water therethrough in the same manner in which the milking process is carried in." j V hat-I claim is: a 1. A mllkmg machine, comprising a cylindricaliopen ended casing, supports for said casing, end closing plugs removably mounted to close thesaid casing ends and to form thereloetween a milk receiving chamber, a piston reciproc'able within said chamber,-means for reciprocating the said pi ston to alternately create-f suction and to exert pressure at opposite-sides of the saidp'i'ston :and within the "said chamber, an inflow and outflow'port-at each'endof'the said cham-j with each said port for controllingthe inflow and outflow of the fluid intoand from casing, end closing pl'ugs-removably mount- I ed toclose the; said casing ends and-to; form therebetween a milk receivin'g1 'chamber,fa piston 'reciprocable within .said chamber,

.be1",'and a single valveabodycooperative;

means for reciprocating the' said piston to alternately create suction a-ndito exert pressure at opposite sides'of the said piston and Within-the said chamber, an inflowand outcense flow port at each end of the said chamber, asingle valve body cooperative with each said port for controllingtheinflow and outflowofthe fluid into and from the said chamber, and means for causing one side only of the machine to function.

and to form therebetween a milk receiving chamber, a piston reciprocable within said chamber, longitudinal bores'in the casing wall, slotways joining said bores and the casing bore, like bores and slotsjin OHQfOf the said end clamping rings,-operating rods slidable in said bores, .an operating head fixedvto all said rods, operating barsi having guide cooperation with grooves in the 03S? ing, circumference and fixed tosaid operating head, means for removablyjoining the operating rods to the said piston, oscillatinglevers link-connected to the said operating bars for reciprocating the sa1d piston to alternately create suction and to exert pressure at theopposite sides of the said piston and Within the said chamber, an inflow and outflow portat eachend of the said chamber, and a single valve body cooperative with each port for controlling the inflow and outflow of the fluid into and i outflow port at each end of the said chamfrom the said chamber. v

4. A milking machine, comprising a cylindrical open ended casing, supports for said casing, end closing plugs removably mounted. to close the said casing ends and to form therebetween a milk receiving chamber, a piston reciprocable within said chamber, means for reciprocating the said piston to alternately create suction and vto exert pressure at opposite sides otthe said piston and Within the said chamber, an inflow and outflow port at each end'o'f the said chamber,-a single valve body cooperative with each said port for controlling the inflow and outflow of the fluid intoand from the said chamber, including a plurality of milk induction passages and a single milk exhaust ing passage, valves for controlling the flow of milk intothe passages, and meansxfor' restricting the outflow of the milk being exhausted. I 4 i- 5. -A'milking machine, comprising a oylindrical'open. ended casing, end supports for said casing, end-clamping rings-for retaining said casing withi'n saidsupports, means for preventing displacement of said casing by rotation,'.end closing plugs re movably mounted toclose vthe saidcasing ends and to form therebetween a'milk re ceiving chamber,a piston reciprocable-withinsaidchamber, longitudinal bores; in the casing wall, slotways joining said bores and the casmgbore, like bores and slots in one of the sa1d end clompmg rings, operating rods slidable in said-bores,ran operating: head fixed to all said rods, operating bars having guide cooperation with grooves in the casing circumference and fixed to said operating head, means for removably joining the operating rods to the said piston, oscillating levers link-connected tothe said operating bars for reciprocating the said piston to alternately create suction and to exert pressure at the opposite sides of the said piston and within the'said chamber, an inflow and outflow port at each end of the said casing, a single valve body cooperative with each port for controlling the inflow and outflow of the fluid into and from the said chamber, including a plurality of- 'milkinduction passagesv and a single milk exhausting passage, valves for controlling the flow of milk intothe passages, and. means forrestricting the outflow of the milk being exhausted. I V.

6. A milking machine, comprising a cylindrical open ended casing, supports for said casing, end closing plugs removably mounted to close the said casing ends and to form therebetween a milk receiving cha n her, a piston reciprocable within said chamber, means for reciprocating the saidpiston to alternately create suction and to Y exert pressure atopposite sides of the said piston and within the said chamber, an inflow and her, a singlervalve body cooperative: with each 'portfor controlling the inflow and outflow of the fluid intoand from the said chamber, including a plurality of milk induction passages and a singlemilk exhausting passage, valves for controlling the flow of milk into the passages and completely closing off one or all of such passages, adjustable means for admitting air into the said passages when said valves are closed off, and means for restricting the outflow ofthe milk being exhausted.

, 7. A milking machine, comprising a cylindrical open ended casing, supports for said casmg, end closing plugs removably mounted to close the said casing ends and totorm therebetween a milk receiving chamber, a piston reciprocable within said chamber, means for reciprocating the said piston to alternately create suction and toexert' V duit pipes communicating" With the outer clamping rings for engaging said enlarged hea'ds to clamp them fiuidtight, clamping nut members for forc ngthe said clampmg .iends of all such passa es,-enlargedheads formed upon said con duit pipes, two-part rings into position, an aperture in each said 'nut member for permittingith e insertion ther- 'ethrouglfoi the said enlarged heads, and means for restrlcting the outflow oft-he milk being exhausted. V

8. A milklng machine, compris ng acyllIlilI 'lCiLl"OP6I1 ended casing, end. supports for each casing, end clamping rings tor -e taining said casing Within-said supports, means for-"preventing displacement of said casingby rotation, end closing plugs remov ably mounted to close the said casingends and. to form therebetween a milk: receiving chamber, a piston reciprocablewithin said chamber, longitudinal bores 1 in the. casing Wall, slotWays joining said boresand the cas-o ing bore, 'like'bores and slots'in one o'f'the' said end clamping rings, operating rods slidable in said bores, an operating head fixed to'all said rods, opera't1ng bars having guide cooperation With grooves in the cas ingcircumference and fixed to said operat c Q, ing'head, means-for removablyjoini-ngthe operating rods'fto thesaid piston, oscillating levers link-'connected'to .the saidfoperatingbars for reciprocatingthe said piston to al ternately create suction and to e-irjert'pressure at the opposite sides of'thesaid piston and Within the said chamben'an inflow and outflow port at each end of the saidchani-f ber, a single valveibody cooperative with each port for'controlling the inflow-and outflow of the fluid into and fromthe said withtheouter ends of all such passages, en- T larged heads formed upon said conduit pipes, two-part clamping rings for en chamber, including a plurality otmilk irr' duction passages and'asingle'milk exhaustw ing passage,valves for controlling the How of milk into the passages and for complete ly closing off one or all of such passages, ad ustable means for admltting air into the said passages When said valves-are closed off, and milk conduit pipescommunicting to clamp nut menigaging said enlarged heads them fluid-tight, clamping bers for forcing the said clamping ringsiinto,

JPOSll' lOIl, an aperture'in each said nut mem ber "for BIIIlltlZln the 1nsert1on there'- rocable piston for alternately-creating sue tion for gathering the milk intdsuch'cham-i her and for ejecting the gathered milk from such chamber, a supplemental chamber com,

bin'ed'with the. main chamber, an inlet and unit for cutting outieither or an outlet port connecting the two"chambers,

an outlet port inth'e supplemental chamber throughvvhich the milk discharged from the] main chamber passes and a valve cooperaf tive With the inlet portto the main chain? I her that opens'under the suction stro'ke' 0;" the piston andfwhich closes the said inlet;

: port on the ejecting stroke of the piston, the

outlet connectingthei two' chambers being at all times open, a 1

10. A milking machine comprising tvvo like'unlts, each unlt mcluding amam m lk receiving chamber, means including a reciprocable piston adapted for first gather ing the milk into such chamber and then ejecting the gathered milk from such 'cham'-- her, a supplemental chamber combined with the main chamber, an inlet and an-outlet' port co'nnecting the two chambers, the's'up plemental chamber having an outlet through Wl'liC-ll'tllGIIlilk ejected from the main'cham-' ber passes, a valve cooperativewvith the in let port to the main chamber vvhich opens under the induction stroke of the piston-and which closes the said inlet portunderjthe milk ejecting stroke of the piston, the" outlet portconnecting the two chambers beinglatk llf' imes Open anda: control valve in each both unitsv from operative adjustment."

ILA milking machine "comprising two like units, each unit includingfa'imainmilk' receiving chamber, means including a 're- 'ciprocable piston "adapted for. first gather-f ing the milk into such chamber and then ejecting the gathered milk from such chamber, a supplemental-chamber combined with the main cl1amber,- aninletandan outlet port connecting thetwo chambers, the sup-f plemental chamber havingan' outlet through which the milk ej ected' from the main chamber passes, avalve cooperativewith-the in let port to the main chambecwhichfop'ens 1 I underthe induction stroke ofgjthe piston? and-Which closes the said 'inletfport under the milk ejecting stroke of thetpiston, the? outlet port connecting the two'chambers being at all times" open "and a control valve in each unit for cutting. out either or both units from operative adjustment, an air inlet inficommunicat ion with the milk intake to each unit,and"means for closing" said airinlet'at times. I 1" I i r 1 "121A milking Imachine comprising an open ended; cylindrical casing, supports for the casing, end 1 closing plugs removably mounted to close the casing end-and to form therebetween a main milk ;receivingjcham her, a piston reciproc'able Within the main chamber, means for reciprocating thepiston to alternately createsuction and to. exert pressure atopposite sides of the said piston and "Within the main chamber, a supplemen-l tal cha'inber cooperative with-each oftheyopposite ends of the main "chamber, inlet and outlet ports connecting the ends of the erative With each inlet port to the main chamber ends, the said Valve operating to open the inlets to the main chamber on the suction strokes of the piston and to close the said inlet on the ejecting or pressure strokes of the piston, and means for cutting out the inlet to the main chamber at either 10 end thereof to cause the other end only of the machine to functio JOHN C. BEEM.. 

